The Scriptural evidence for the doctrine of the Godhead Trinity is summed up in the following nine propositions:
There is one God
Go therefore and make disciples of all the nations,
baptizing them in the name
of the Father
and the Son
and the Holy Spirit.
Matthew 28:19
And Jesus answered him,
The first of all the commandments is,
Hear, O Israel; The Lord our God is one Lord:
Mark 12:29
The Father is God
...which the Son of man shall give unto you:
for him hath God the Father sealed.
John 6:27
The Son is God
In the beginning was the Word,
and the Word was with God,
and the Word was God.
John 1:1
The Holy Spirit is God
But he that shall blaspheme against the Holy Ghost
hath never forgiveness,
but is in danger of eternal damnation:
Mark 3:29
The Three are separate from each other
The grace of the Lord Jesus Christ, and the love of God,
and the fellowship of the Holy Spirit, be with you all.
2 Corinthians 13:14
The Father is personal
As the Father hath loved me, ....
John 15:9
The Son is personal
I live by the faith of the Son of God,
who loved me, and gave himself for me.
Galatians 2:20
The Holy Ghost is personal
Likewise the Spirit also helpeth our infirmities:
for we know not what we should pray for as we ought:
but the Spirit itself maketh intercession for us
with groanings which cannot be uttered.
Romans 8:26
The Three are One
The LORD our God is one LORD:
Deuteronomy 6:4